Ublox NINA-B4 Series, Руководство по системной интеграции, Страница: 17 / 61

NINA-B4 series - System integration manual
UBX-19052230 - R09 Design-in Page 17 of 61
C1-Public
For further information about current consumption and other performance data, see also the
electrical specifications in the respective product datasheet
[2][3] .
It is best practice to include bypass capacitors on the supply rails close to the
NINA-B4 series module. Depending on the design of the power routing on the host system,
capacitance might not be needed.
2.2.3.2 Switched Mode Power Supply
A Switched Mode Power Supply (SMPS) is ideal in situations where the available primary supply
source has more than a moderately higher value than the operating supply voltage of the module. An
SMPS minimizes the amount of current drawn from the main supply and optimizes power efficiency
in the final application design.
⚠
When using an SMPS, ensure that the AC voltage ripple at switching frequency is kept as low as
possible. The layout design must minimize impact of high frequency ringing.
2.2.3.3 Low Drop Out (LDO) regulator
An LDO linear regulator provides a convenient primary supply option when the voltage difference
between the main supply and module VCC is reasonably small. The benefit of an LDO source over
SMPS is that an LDO is simpler to integrate and does not generate switching noise. However, with a
larger voltage difference, the superior efficiency of an SMPS converter provides less heat dissipation
and a longer operating time in battery-powered products.
As a contingency against “latch up”, include an over -current limiter to protect the module from
electrical over stress (EOS). An LDO or SMPS serves this purpose.
2.3 System function interfaces
2.3.1 Module reset
You can reset NINA-B4 modules by applying a low level on the RESET_N input pin, which is normally
set high with an internal pull- up. This causes an “external” or “hardware” reset of the module. The
current parameter settings are not saved in the non-volatile memory of the module and a proper
network detach is not performed.
2.3.2 Internal temperature sensor
The radio chip in NINA-B4 contains a temperature sensor used for over and under temperature
shutdown.
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The temperature sensor is located inside the radio chip and should not be used if an accurate
temperature reading of the surrounding environment is required.